Packing.



N. B. MILLER.

PACKING.

APPLIOATION FILED Nov.12. 1908.

917,637'. Patented Apr. 6, 1909.

1HE NoRRls Pertes co., wAsHmcwN. n. c.

UNITED STAPES PATENT OFFICE NORMAN BRUCE MILLER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CLEMENT RESTEIN COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYLVAN IA.

PACKING.

Specication of Letters Patent.

Application filed November l2, 190B.

Patented April 6, 1909.

Serial No. 462,214.

To all whom it may concern.'

Be it known that I, NORMAN BRUCE MIL- LER, a citizen of the United States, and resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, hare invented certain new and useful Improvements in Packing, of which the following is a specilication.

he object of the present invention is to provide a packing for piston rings which will not in the cylinder either by reason ol its swelling or by reason oi its being drawn up or compressed by the action oi: theadjustment of parts of the piston.

To this and other ends hereinafter set forth the invention stated in general terms cornprises the inij'iroveinents to be presently described and nally claimed.

The na ure, characteristic lfeatures and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawing forming part hereof and in which is illustrated a perspective view of a piece oi packing embodying features ci the invention` In the drawings the packing l, is square in cross section and it is provided with a hollow core or central opening 2 which is also square in cross-section and extends throughout the length of the packing. The substantially rectangular form ofthe opening 2 is an essential o1 the invention.

In use the packing` is placed as a ring in a groove upon the surface of the piston so that the packing niay not expand laterally and it it should swell it will not project unduly beyond the curved face of the piston in which position it would bend upon the internal wall of the cylinder, because the substantially rectangular shape ot the opening 2 permits it to expand inward, thus as it were reducing the size of the opening 2. In other words, the shape ot the opening 2 is such that the packing can readily expand inward and in consequence of this it does not bulge outward where it would bind on the cylinder. To illustrate this it niay be said that if the opening 2 were substantially circular it would constitute an arch and the least line of resistance would be for the packing to bulge outward under the effect of lateral pressure, but since the opening 2 is rectangular the least line of resistance is for the packing to bulge inward, Furthermore when the sides of the packing are compressed by reason of the drawing up of the abutting'parts of the piston the packing b'ulges inward in the inanner described so that it does not jani upon the inner surface of the cylinder. The lie-.ct that the packing bulges inward instead oi becoming concaved on its outside working face produces another important feature, in that the corners of the packing adjacent to the cylinder surfaces remain sharp and these corners are an important factor in etlecting a tight oint.

The packingl inay be composed oil layers ol' fabric and rubber or ceincnt and it can be inade by rolling the fabric upon a square or rectangular rod in which case its exterior would be cylindrical. However, while the rod is in position the packing can be coinprcssed into generally rectangular l'orni whereupon the rod can be withdrawn.

It will be obvious to those skilled in the art to which the invention relates that `diodi-- iications may be inade in details without departing i'roin the spirit thereof, hence the invention is not limited lui-ther than the prior state o'l the art may require, but

IIaving thus described the nature and cbM jects oi iny invention what I claiin as new desire to secure by Letters Patent ish l. A packing rectangular in crossscction and having an unobstructed open space or cavity extending lengthwise ol the par-.king throughout the length thereof, substantially as described.

2. A packing rectangular in cross-secticn and having a hollow core also rectangular in cross-section arranged axially ot the packing and extending throughout the length thereol', substantially as described.

3. A packing consisting oi' layers ol ceniented together and being oi' rectal external 'forni and having` a ha, low structed core of generally rect.: j dar crass section extending axially throughout the packing and in the direction ol its length, substantially as described.

In testimony whereoll I have hereunto signed iny naine.

ERANK E. FRENCH, A. B. SLOUGHTON. 

